Place all dressing ingredients in a small- to medium-sized mixing bowl.
Whisk to combine. Add the cucumber and the tomato, and gently
stir to coat the vegetables with dressing. Allow this mixture to sit,
marinating the vegetables a bit, while preparing the rest of the salad.

Next, place spinach, garbanzo beans, and tuna in a very large salad
bowl or large stainless-steel mixing bowl. Add the dressing and veggie
mixture and toss thoroughly but gently to combine.

Notes:

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